| E | O (JD) | O (dat) | Period |
| -58 | 2415295 | 1900-10-02 | 504.84 |
| -56 | 2416260 | 1903-05-25 | 504.5 |
| -55 | 2416759 | 1904-10-05 | 505.26 |
| -54 | 2417263 | 1906-02-21 | 507.17 |
| -53 | 2417834 | 1907-09-15 | 508.24 |
| -52 | 2418299 | 1908-12-23 | 507.32 |
| -51 | 2418799 | 1910-05-07 | 510.51 |
| -50 | 2419316 | 1911-10-06 | 509.72 |
| -49 | 2419847 | 1913-03-20 | 510.35 |
| -48 | 2420355 | 1914-08-10 | 508.25 |
| -47 | 2420827 | 1915-11-25 | 508.79 |
| -46 | 2421373 | 1917-05-24 | 508.37 |
| -45 | 2421857 | 1918-09-20 | 507.25 |
| -44 | 2422409 | 1920-03-25 | 506.03 |
| -43 | 2422874 | 1921-07-03 | 506.7 |
| -42 | 2423369 | 1922-11-10 | 507.42 |
| -41 | 2423897 | 1924-04-21 | 505.51 |
| -40 | 2424401 | 1925-09-07 | 505.44 |
| -39 | 2424899 | 1927-01-18 | 503.98 |
| -38 | 2425420 | 1928-06-22 | 503.91 |
| -37 | 2425926 | 1929-11-10 | 502.9 |
| -36 | 2426416 | 1931-03-15 | 501.69 |
| -35 | 2426919 | 1932-07-30 | 500.95 |
| -34 | 2427417 | 1933-12-10 | 500.4 |
| -33 | 2427897 | 1935-04-04 | 499.19 |
| -32 | 2428416 | 1936-09-04 | 501.27 |
| -31 | 2428926 | 1938-01-27 | 501.67 |
| -30 | 2429414 | 1939-05-30 | 501 |
| -29 | 2429917 | 1940-10-14 | 500.28 |
| -28 | 2430408 | 1942-02-17 | 500.03 |
| -27 | 2430957 | 1943-08-20 | 499.33 |
| -25 | 2431923 | 1946-04-12 | 499.56 |
| -24 | 2432410 | 1947-08-12 | 500.24 |
| -23 | 2432902 | 1948-12-16 | 499.75 |
| -22 | 2433411 | 1950-05-09 | 500.33 |
| -21 | 2433921 | 1951-10-01 | 500.71 |
| -20 | 2434428 | 1953-02-19 | 503.71 |
| -19 | 2434930 | 1954-07-06 | 504.68 |
| -18 | 2435415 | 1955-11-03 | 505.07 |
| -17 | 2435939 | 1957-04-10 | 505.1 |
| -16 | 2436450 | 1958-09-03 | 504.7 |
| -15 | 2436947 | 1960-01-13 | 503.66 |
| -14 | 2437449 | 1961-05-29 | 503.34 |
| -13 | 2437957 | 1962-10-19 | 503.26 |
| -12 | 2438468 | 1964-03-13 | 501.14 |
| -11 | 2438961 | 1965-07-19 | 500.13 |
| -10 | 2439445 | 1966-11-15 | 500.91 |
| -9 | 2439957 | 1968-04-10 | 500.2 |
| -8 | 2440466 | 1969-09-01 | 498.15 |
| -7 | 2440946 | 1970-12-25 | 498.92 |
| -6 | 2441448 | 1972-05-10 | 500.28 |
| -5 | 2441976 | 1973-10-20 | 501.93 |
| -4 | 2442452 | 1975-02-08 | 501.21 |
| -3 | 2442921 | 1976-05-22 | 500.13 |
| -2 | 2443468 | 1977-11-20 | 501.08 |
| -1 | 2443970 | 1979-04-06 | 499.62 |
| 0 | 2444485 | 1980-09-02 | 499.29 |
| 1 | 2444957 | 1981-12-18 | 500.39 |
| 2 | 2445437 | 1983-04-12 | 499.61 |
| 3 | 2445967 | 1984-09-23 | 497.63 |
| 4 | 2446438 | 1986-01-07 | 497.7 |
| 5 | 2446959 | 1987-06-12 | 499.75 |
| 6 | 2447459 | 1988-10-24 | 502.18 |
| 7 | 2447943 | 1990-02-20 | 503.02 |
| 8 | 2448452 | 1991-07-14 | 502.84 |
| 9 | 2448947 | 1992-11-20 | 505.23 |
| 10 | 2449484 | 1994-05-11 | 505.16 |
| 11 | 2449977 | 1995-09-16 | 506.07 |
| 12 | 2450474 | 1997-01-25 | 506.7 |
| 13 | 2450979 | 1998-06-14 | 507.05 |
| 14 | 2451508 | 1999-11-25 | 506.78 |
| 15 | 2451997 | 2001-03-28 | 506.26 |
| 16 | 2452505 | 2002-08-18 | 507.97 |
| 17 | 2453008 | 2004-01-03 | 508.95 |
| 18 | 2453531 | 2005-06-09 | 509.2 |
| 19 | 2454024 | 2006-10-15 | 509.7 |
| 20 | 2454539 | 2008-03-13 | 511.99 |
| 21 | 2455062 | 2009-08-18 | 511.95 |
| 22 | 2455570 | 2011-01-08 | 511.77 |
| 23 | 2456076 | 2012-05-28 | 510.36 |
| 24 | 2456596 | 2013-10-30 | 509.45 |
| 25 | 2457124 | 2015-04-11 | 507.31 |
| 26 | 2457609 | 2016-08-08 | 506.08 |
| 27 | 2458119 | 2017-12-31 | 505.23 |
| 28 | 2458611 | 2019-05-07 | 503.87 |
| 29 | 2459115 | 2020-09-22 | 501.25 |
| 30 | 2459613 | 2022-02-02 | 498.71 |
| E | Cycle number from the GCVS4 epoch. |
| O (JD) | Julian date at observed time for maximum. |
| O (Dat) | Same as above, expressed as date. |
| Period | Calculated mean period at cycle number E. |